I am at the point of choosing which weapon to use going forward, the base stats are:
Enserric attack bonus 28/23/18/13 +4 slashing/ +5 regen
I can upgrade him to +8 and add Keen, Haste and acid damage for 32/27/22/17

Holy Avenger: 29/24/19/14, Holy Avenger (1d6 v evil, +5 )
With HA, I can add Keen, Haste, SR acid damage and True Seeing
In order to upgrade the Avenger to +6, i have to buy the enhancement six times, it does not seem to stack with the Holy Avenger quality. Am I misreading that or do the Holy Avenger attack bonuses not show on the character sheet?

It seems to me it would be better to have the 1d6 divine damage and SR than have an additional +3 from Enserric. Is this thinking correct?

Thank you.

Is your character a Paladin?

As far as the swords go, the +1d6 averages 3.5 points of damage, while the extra on Enserric is +3 constant. I'd go with the constant, personally. I believe the SR is low enough to be not worth considering.

Thank you. My PC is a fighter/ paladin/ CoT (trying the Divine Warrior build from the epic builds list.)